Last frost date in Bozeman, Montana
May 26
Average last frost in spring. In an early year (1 in 10) it's over by May 9; in a late year (1 in 10) it comes after June 14.
September 22
Average first frost in fall. 1 year in 10 it comes by September 5.
Source: NOAA U.S. Climate Normals 1991–2020, station Bozeman Montana State Univ (USC00241044), 1.5 miles from Bozeman, elevation 4,913 ft. NOAA National Centers for Environmental Information. These are long-term averages, not a forecast.
| Early year | Average | Late year | |
|---|---|---|---|
| Last frost in spring | May 9 | May 26 | June 14 |
| First frost in fall | Sept 5 | Sept 22 | Oct 5 |
An early or late year is one in 10: 1 year in 10 the frost comes before the early date, and 1 year in 10 after the late date.
Frost-free days in an average year: 116
Planting calendar for Bozeman
Fall planting
USDA dates for places whose average first freeze is about September 20 (Bozeman: September 22).
- Broccoli plantsMay 1 – June 15 (past for this year)
- Brussels sprouts plantsMay 1 – June 15 (past for this year)
- Cabbage plantsMay 1 – June 15 (past for this year)
- Cantaloupe (muskmelon)May 1 – June 15 (past for this year)
- Cauliflower plantsMay 1 – July 1 (past for this year)
- PotatoesMay 1 – June 15 (past for this year)
- WatermelonMay 1 – June 15 (past for this year)
- Celery and celeriac plantsMay 15 – July 1 (past for this year)
- Chervil and chivesMay 15 – June 15 (past for this year)
- Collards plantsMay 15 – June 15 (past for this year)
- ParsnipsMay 15 – June 15 (past for this year)
- Summer squashMay 15 – July 1 (past for this year)
- Witloof chicoryMay 15 – June 15 (past for this year)
- SalsifyMay 20 – June 20 (past for this year)
- Winter squashMay 20 – June 10 (past for this year)
- BeetsJune 1 – July 1 (past for this year)
- CarrotsJune 1 – July 1 (past for this year)
- Chinese cabbageJune 1 – July 1 (past for this year)
- CucumbersJune 1 – 15 (past for this year)
- DandelionJune 1 – July 1 (past for this year)
- Florence fennelJune 1 – July 1 (past for this year)
- Garden peasJune 1 – July 15 (past for this year)
- Head lettuce plantsJune 1 – July 15 (past for this year)
- KaleJune 1 – July 1 (past for this year)
- KohlrabiJune 1 – July 15 (past for this year)
- Leaf lettuceJune 1 – Aug 1 (past for this year)
- Mustard greensJune 1 – Aug 1 (past for this year)
- OkraJune 1 – 20 (past for this year)
- ParsleyJune 1 – July 1 (past for this year)
- Peppers plantsJune 1 – 20 (past for this year)
- RadishesJune 1 – Aug 15 (past for this year)
- RutabagaJune 1 – July 1 (past for this year)
- Snap beansJune 1 – July 1 (past for this year)
- SorrelJune 1 – July 1 (past for this year)
- SpinachJune 1 – Aug 1 (past for this year)
- Sweet cornJune 1 – July 1 (past for this year)
- Swiss chardJune 1 – July 1 (past for this year)
- TomatoesJune 1 – 20 (past for this year)
- TurnipsJune 1 – July 15 (past for this year)
- Corn saladJune 15 – Aug 1 (past for this year)
- EndiveJune 15 – July 15 (past for this year)
- Upland cressJune 15 – Aug 1 (past for this year)
- Rhubarb plantsSept 15 – Nov 1Now
USDA lists garlic, horseradish, leeks, onion plants, onion seed, onion sets, shallots as generally spring-planted here.
Spring planting
USDA dates for places whose average last freeze is about May 30 (Bozeman: May 26).
- SpinachApr 20 – June 15
- Asparagus plantsMay 1 – June 1
- BeetsMay 1 – June 15
- Chervil and chivesMay 1 – June 1
- Corn saladMay 1 – June 15
- DandelionMay 1 – 30
- EndiveMay 1 – 30
- Florence fennelMay 1 – 30
- Garden peasMay 1 – June 15
- GarlicMay 1 – 30
- Horseradish plantsMay 1 – 30
- KaleMay 1 – 30
- KohlrabiMay 1 – 30
- LeeksMay 1 – 15
- Onion plants plantsMay 1 – 30
- Onion seedMay 1 – 30
- Onion setsMay 1 – 30
- PotatoesMay 1 – June 15
- RadishesMay 1 – June 15
- Rhubarb plantsMay 1 – 20
- ShallotsMay 1 – June 1
- TurnipsMay 1 – June 15
- Broccoli plantsMay 10 – June 10
- Brussels sprouts plantsMay 10 – June 10
- Cabbage plantsMay 10 – June 15
- CarrotsMay 10 – June 1
- Chinese cabbageMay 10 – June 15
- Collards plantsMay 10 – June 1
- Head lettuce plantsMay 10 – June 30
- Leaf lettuceMay 10 – June 30
- Mustard greensMay 10 – June 30
- ParsleyMay 10 – June 1
- ParsnipsMay 10 – June 1
- RutabagaMay 10 – 20
- SalsifyMay 10 – June 1
- SorrelMay 10 – June 10
- Upland cressMay 15 – June 1
- Cauliflower plantsMay 20 – June 1
- Celery and celeriac plantsMay 20 – June 1
- Sweet cornMay 20 – June 1
- Swiss chardMay 20 – June 1
- Snap beansMay 25 – June 15
- New Zealand spinachJune 1 – 15
- Peppers plantsJune 1 – 15
- Summer squashJune 1 – 20
- Witloof chicoryJune 1 – 15
- TomatoesJune 5 – 20
Planting dates: USDA Home and Garden Bulletin No. 9 (1967), “Suburban and Farm Vegetable Gardens,” tables 4 and 5 (earliest safe spring and latest safe fall dates), applied to this place's NOAA frost dates. “Plants” means setting out transplants, not sowing seed. How we match the table.
Nearby in Montana
- Belgrade 9 mi · last frost May 26
- Helena 78 mi · last frost May 9
- Butte-Silver Bow (balance) 79 mi · last frost June 13
- Billings 121 mi · last frost May 4
- Great Falls 126 mi · last frost May 6